Reservoir



FIG. 1 is a front-top perspective view of a reservoir showing the claimed design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The shade lines in the figures show contour and not surface ornamentation. 

CLAIM The ornamental design for a reservoir, as shown. 